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The Dodge County Sheriff's Department said a 53-year-old worker was trapped under the concrete but had been rescued.

"I was just taking a walk in the park and the next thing I heard was this big boom," said resident Rick Alverson.

Alverson dialed 911 for assistance as construction crews worked to free the man.

"We were able to slide him through some narrow openings," said fire chief Matt Pieper. "They were cutting some rebar and the structure fell on top of him."

The 53-year-old construction worker from Shawano was not injured in the incident. Hustisford police chief Dan Link said the worker was alive thanks to the quick response of multiple agencies.

"There are a lot of things that could have gone wrong -- the way that person was trapped in the structure," he said. "Everybody worked together as a team and I can't say enough about thanking everybody that was here to help."

Dodge County Emergency Management said there is no significant danger of the dam breaching or any flooding. Government inspectors will check the integrity of the structure on Friday and file a report before repairs are allowed to continue.